The Strongest Wizard Making Full Use of the Strategy Guide -No Taking Orders, I’ll Slay the Demon King My Own Way-

「攻略本」を駆使する最強の魔法使い ～＜命令させろ＞とは言わせない俺流魔王討伐最善ルート～

Magnus, a wizard who gets ordered around by the hero, is kicked out of the party. Right after that, he receives a book written in the language of the gods detailing all the information he would need to defeat the demon king-the ultimate strategy guide! (Source: Manga UP!)